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ostronom/wtf.sql

Last active September 8, 2016 12:48
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wtf.sql
-- CREATE TABLE t (id bigint primary key, c bigint not null)
BEGIN;
UPDATE t SET c=1 WHERE id=1;
INSERT INTO t (id, c) SELECT 1, 1 WHERE NOT EXISTS (SELECT 1 FROM t WHERE id=1);
END;
-- pg 9.4.8
-- contraint violation: duplicate key `id`
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